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The girlfriend of Marsh's father, Sarah Hodge, spoke of her shock on seeing the reports and footage of the theft.

CCTV footage shows Marsh handling the AR15 sports rifle

Federal agents are now concerned about the store's security after Marsh was able to walk out with the gun

Store management said they didn't notice the gun was missing until police contacted them after the gun was found in a nearby hotel

Marsh is seen here leaving the store, gun in hand, without being noticed by store workers

'It's unbelievable,' Ms Hodge said.

Marsh had been staying with ms Hodge for the previous two years, and she said the 26 year old had suffered from Schizophrenia, and other mental issues. Marsh had been off his medication at the time of Saturday's arrest.

She added that she was happy the young man had been caught: 'I'm sorry Jordan but you need help.'

Police said Riverview Gun Sales had no idea the AR-15 Marsh stole was missing. Management at the store didn't know about 11 guns that Marsh had allegedly stolen last year until they were notified by detectives.

Inventory control issues at Riverview Gun Sales have occurred before. In 2007, state police raided a Somers home and found a bunch of stolen guns from the store.

'It was found that the same Riverview gun store was missing upwards of 30-plus guns,' said East Windsor police Detective Matthew Carl.